Serde's Serialize implementation not found for Rocket's UUID - rust

Question

I'm trying to create a custom struct using the UUID struct from Rocket as a field type. I want it to be serialized using Serde in order to convert it to JSON easily.
When trying to do this, I get an error:
error[E0277]: the trait bound `rocket_contrib::UUID:
model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Serialize` is not
satisfied
--> src/service/document.rs:4:10
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^ the trait
`model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Serialize` is not
implemented for `rocket_contrib::UUID`
|
= note: required by `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::ser::SerializeStruct::serialize_field`
error[E0277]: the trait bound `rocket_contrib::UUID:
model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not satisfied
--> src/service/document.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^^^ the trait
`model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not implemented for `rocket_contrib::UUID`
|
= note: required by `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::de::SeqAccess::next_element`
error[E0277]: the trait bound `rocket_contrib::UUID: model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not satisfied
--> src/service/document.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^^^ the trait `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not implemented for `rocket_contrib::UUID`
|
= note: required by `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::de::MapAccess::next_value`
My struct:
#[derive(Serialize, Deserialize)]
pub struct Document {
id: UUID,
user_id: UUID,
created: i64,
updated: i64,
text: String
}
My imports:
[dependencies]
rocket = "0.3.17"
rocket_codegen = "0.3.17"
serde_derive = "1.0.80"
serde = "1.0.80"
chrono = "0.4"
[dependencies.rocket_contrib]
version = "0.3.17"
default-features = false
features = ["json", "uuid", "serde"]
Endpoint where I use the struct:
#[get("/document/<id>")]
pub fn get_document(id: UUID) -> status::Accepted<Json<Document>> {
status::Accepted(Some(Json(document::get_document(id))))
}
I've checked all dependencies, and I have the serde feature enabled in rocket_contrib. I've run out of ideas what to check next.

Answer 1

rocket_contrib::UUID does not implement Serialize:
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub struct UUID(uuid_ext::Uuid);
If the type doesn't implement Serialize, you can't make it.
As mcarton points out:
you still can implement Serialize for your type, you simply can't derive it and will have to implement it by hand.
That could look something like:
#[derive(Serialize, Deserialize)]
pub struct Document {
#[serde(with = "my_uuid")]
id: UUID,
#[serde(with = "my_uuid")]
user_id: UUID,
created: i64,
updated: i64,
text: String,
}
mod my_uuid {
use rocket_contrib::UUID;
use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
use std::str::FromStr;
pub fn serialize<S>(val: &UUID, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
val.to_string().serialize(serializer)
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<UUID, D::Error>
where
D: Deserializer<'de>,
{
let val: &str = Deserialize::deserialize(deserializer)?;
UUID::from_str(val).map_err(D::Error::custom)
}
}
See also:
How to transform fields during serialization using Serde?
How to transform fields during deserialization using Serde?
Is there a way for me to use #[derive] on a struct or enum from a library without editing the actual library's source code?
How do I implement a trait I don't own for a type I don't own?
Add Serialize attribute to type from third-party lib